.box{
    width: 80%;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin: 40px auto;
    color: blue;
}
h2 {
    text-align: center;
    margin-bottom: 20px;
}
form {
    display: grid;
    gap: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 100px 1fr 100px 1fr; 
    gap: 10px;
}                   

.span2 {
    grid-column: span 2;   /* รวม 2 คอลัมน์ */
}

.span3 {
    grid-column: span 3;   /* รวม 3 คอลัมน์ */
}
    input[type="text"], input[type="email"], input[type="password"], select, textarea {
    width: 100%;
    padding: 10px;
    margin: 5px 0 15px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    background-color: #ccf3faff;
    font-size: 18px;
}
input[type="text"]:focus, input[type="email"]:focus, input[type="password"]:focus, select:focus, textarea:focus {
    border: 1px solid #300468ff;
    background-color: #e6f7f9ff;
    outline: none;
}
label{
    font-weight: bold;
    color: #300468ff;
    margin: 5px 0 10px 0;
    padding-top: 7px;
}
.h1from {
    color: #4f08acff;
    font-weight: bold;
    margin-bottom: 10px;
    font-size: 40px;
}

button {
    padding: 15px 25px;
    font-size: 18px;
    color: #fff;
    border: none;
    border-radius: 26px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.297);
    padding: 15px 25px;
    cursor: pointer;
    overflow: hidden;
    position: relative;

    background: linear-gradient(270deg, #ff00cc, #3333ff, #00eaff, #00ff6a);
    background-size: 800% 800%;

    animation: animeGradient 4s ease infinite;
    transition: transform 2.5s;
}

/* เอฟเฟกต์ตอน hover */
button:hover {
    transform: translateX(10px) scale(1.05); 
}

/* Keyframes สำหรับไล่สี */
@keyframes animeGradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}


/* สำหรับขนาดหน้าจอเล็ก */
@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}
#username-error {
    margin-top: 5px;
    font-size: 14px;
}